<template>
  <div class="home" style="padding: 10px">
    <!--    功能区域-->
    <div style="margin: 10px 0">
      <el-button type="primary" @click="add" v-if="user.role==1">新增</el-button>
      <el-popconfirm title="确定删除吗?" @confirm="deleteBatch">
        <template #reference>
          <el-button type="danger">批量删除</el-button>
        </template>
      </el-popconfirm>
    </div>
    <!--    搜索区域-->
    <div style="margin: 10px 0">
      <el-input v-model="search" @input="onInput" style="width: 20%;" clearable placeholder="请输入关键字"/>
      <el-button type="primary" @click="load" style="margin-left: 5px">查询</el-button>
    </div>
    <!--    表格区域-->
    <el-table :data="tableData" border stripe style="width: 100%" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55"/>
      <el-table-column prop="id" label="ID" sortable/>
      <el-table-column prop="name" label="书名"/>
      <el-table-column prop="price" label="价格"/>
      <el-table-column prop="author" label="作者"/>
      <el-table-column prop="createTime" label="出版日期"/>
      <el-table-column prop="cover" label="封面">
      <template #default="scope">
        <div class="demo-image__preview">
          <el-image
              style="width:100px;height: 100px"
              :src="scope.row.cover"
              :preview-src-list="[scope.row.cover]"
              #placeholder="暂无封面"
              fit="cover"
          >

          </el-image>
        </div>
      </template>
      </el-table-column>

      <el-table-column label="操作">
        <template #default="scope">
          <el-button size="small" @click="handleEdit(scope.row)"
          >编辑
          </el-button>

          <el-popconfirm title="确定删除吗?" @confirm="handleDelete(scope.row.id)">
            <template #reference>
              <el-button
                  size="small"
                  type="danger"
              >删除</el-button>
            </template>
          </el-popconfirm>
        </template>
      </el-table-column>
    </el-table>

    <!--    分页-->
    <div style="margin: 10px 0">
      <el-pagination
          :currentPage="currentPage"
          :page-sizes="[5,10,20]"
          :page-size="pageSize"
          :small="small"
          :disabled="disabled"
          :background="background"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total"
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
      >
      </el-pagination>

      <!--      弹窗-->
      <el-dialog
          :title="提示"
          v-model="dialogVisible"
          title="Tips"
          width="30%"
      >

        <el-form :model="form" label-width="120px">
          <el-form-item label="书名">
            <el-input v-model="form.name" style="width: 80%;"></el-input>
          </el-form-item>
          <el-form-item label="价格">
            <el-input v-model="form.price" style="width: 80%;"></el-input>
          </el-form-item>
          <el-form-item label="作者">
            <el-input v-model="form.author" style="width: 80%;"></el-input>
          </el-form-item>
          <el-form-item label="出版时间">
            <el-date-picker v-model="form.createTime" type="date" value-format="YYYY-MM-DD" style="width: 80%;" clearable></el-date-picker>
          </el-form-item>
          <el-form-item label="封面">
            <el-upload
                ref="upload"
                action="http://localhost:9090/files/upload"
                :on-success="filesUploadSuccess"
            >
              <el-button type="primary">点击上传</el-button>

            </el-upload>
          </el-form-item>

        </el-form>

        <template #footer>
          <span class="dialog-footer">
            <el-button @click="dialogVisible = false">取消</el-button>
            <el-button type="primary" @click="save">确定</el-button>
          </span>
        </template>
      </el-dialog>
    </div>
  </div>
</template>

<script>

import request from "@/utils/request";

export default {
  name: 'Book',
  components: {},
  data() {
    return {
      form: {},
      dialogVisible: false,
      serch: '',
      currentPage: 1,
      pageSize: "10",
      total: 0,
      user:{},
      tableData:[
        {
          ID: '1',
          name: 'Tom',
          price: '189号',
          author: 18,
          createTime: "男",
        }
      ],
      ids:[]
    }
  },
  //生命周期函数
  created() {
    //调用load()
    let userStr = sessionStorage.getItem("user") || "{}"
    this.user = JSON.parse(userStr)

    //请求服务端，确认当前登录用户的信息
    request.get("/user/"+this.user.id).then(res=>{
      if (res.code === '0')
      {
        this.user = res.data
      }
    })
    this.load()
  },

  methods: {
    deleteBatch(){
      //判断是否选择数据
      if (!this.ids.length)
      {
        this.$message.warning("请选择数据！")
        return
      }else {
        //向后台发送数据
        request.post("/book/deleteBatch",this.ids).then(res=>{
          console.log(this.ids)
          console.log(res)
          if (res.code === '0'){
            this.$message.success("批量删除成功")
            this.load()//更新数据
          }else {
            this.$message.error(res.msg)
          }
        })
      }
    },
    handleSelectionChange(val){
      //val就是选中的所有的行对象
      //通过map方法将对象的id属性变成一个数组  [{id.name},{id,name}] => [id,id]
      this.ids = val.map(v => v.id)
    },
    filesUploadSuccess(res){
      console.log(res)
      this.form.cover = res.data
    },
    onInput() {
      this.$forceUpdate();
    },
    load() {
      //传入三个参数 get请求不能传对象
      request.get("/book", {
        params: {
          pageNum: this.currentPage,
          pageSize: this.pageSize,
          search: this.search
        }
      }).then(res => {
        this.tableData = res.data.records;
        //实现前端显示总条数
        this.total = res.data.total;
        // console.log(res)
      })
    },
    add() {
      //打开弹窗
      this.dialogVisible = true;
      //清空
      this.form = {}
      if (this.$refs['upload']){
        this.$refs['upload'].clearFiles()//清除历史文件
      }
    },
    //点击确认后保存到后台
    save() {
      //使用axios进行数据交互
      //两个参数，url和请求参数

      /*      注意这样写会有跨域问题
              request.post("/book",this.form).then(res => {
              console.log(res)
            })

            request.post("http://localhost:9090/book",this.form).then(res => {
              console.log(res)
            })
      */
      //如果id存在 执行更新操作  否则执行新增操作
      if (this.form.id) {//更新
        request.put("/book", this.form).then(res => {
          // console.log(res)
          //根据状态码判断 0为成功 这里用了elmentui 的提示框
          if (res.code === '0') {
            this.$message({
              type: "success",
              message: "更新成功"
            })
          } else {
            this.$message({
              type: "error",
              message: res.msg
            })
          }

          this.load()//刷新表格数据
          this.dialogVisible = false //关闭弹窗
        })
      } else {//新增
        request.post("/book", this.form).then(res => {
          console.log(res)
          if (res.code === '0'){
            this.$message({
              type: "success",
              message:"新增成功"
            })
          }else {
            this.$message({
              type: "error",
              message:res.msg
            })
          }

          this.load()//刷新表格数据
          this.dialogVisible = false //关闭弹窗
        })
      }

    },
    handleEdit(row) {
      this.form = JSON.parse(JSON.stringify(row));
      // console.log(this.form)
      this.dialogVisible = true
      //处理未来元素 因为弹窗是异步加载的
      this.$nextTick(()=>{
        if (this.$refs['upload']){
          this.$refs['upload'].clearFiles()//清除历史文件
        }
      })
    },
    handleDelete(id) {
      request.delete("/book/"+id).then(res => {
        if (res.code === '0'){
          this.$message({
            type: "success",
            message:"删除成功"
          })
        }else {
          this.$message({
            type: "error",
            message:res.msg
          })
        }

        this.load()//刷新表格数据
      })
    },
    handleSizeChange(pageSize) {
      this.pageSize = pageSize
      this.load();
    },
    handleCurrentChange(currentPage) {
      this.currentPage = currentPage
      this.load();
    }
  }
}
</script>


<style scoped>
.demo-image__error .image-slot {
  font-size: 30px;
}
.demo-image__error .image-slot .el-icon {
  font-size: 30px;
}
.demo-image__error .el-image {
  width: 100%;
  height: 100%;
}
</style>
